diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched.c | 40 | ||||
| -rw-r--r-- | kernel/sched_fair.c | 21 |
2 files changed, 38 insertions, 23 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 6c819f338b1..f0ccb8b926c 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -1538,6 +1538,26 @@ static unsigned long target_load(int cpu, int type) return max(rq->cpu_load[type-1], total); } +static struct sched_group *group_of(int cpu) +{ + struct sched_domain *sd = rcu_dereference(cpu_rq(cpu)->sd); + + if (!sd) + return NULL; + + return sd->groups; +} + +static unsigned long power_of(int cpu) +{ + struct sched_group *group = group_of(cpu); + + if (!group) + return SCHED_LOAD_SCALE; + + return group->cpu_power; +} + static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd); static unsigned long cpu_avg_load_per_task(int cpu) @@ -3982,26 +4002,6 @@ ret: return NULL; } -static struct sched_group *group_of(int cpu) -{ - struct sched_domain *sd = rcu_dereference(cpu_rq(cpu)->sd); - - if (!sd) - return NULL; - - return sd->groups; -} - -static unsigned long power_of(int cpu) -{ - struct sched_group *group = group_of(cpu); - - if (!group) - return SCHED_LOAD_SCALE; - - return group->cpu_power; -} - /* * find_busiest_queue - find the busiest runqueue among the cpus in group. */ diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 09d19f77eb3..eaa00014b49 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -1333,10 +1333,25 @@ static int select_task_rq_fair(struct task_struct *p, int flag, int sync) for_each_domain(cpu, tmp) { /* - * If power savings logic is enabled for a domain, stop there. + * If power savings logic is enabled for a domain, see if we + * are not overloaded, if so, don't balance wider. */ - if (tmp->flags & SD_POWERSAVINGS_BALANCE) - break; + if (tmp->flags & SD_POWERSAVINGS_BALANCE) { + unsigned long power = 0; + unsigned long nr_running = 0; + unsigned long capacity; + int i; + + for_each_cpu(i, sched_domain_span(tmp)) { + power += power_of(i); + nr_running += cpu_rq(i)->cfs.nr_running; + } + + capacity = DIV_ROUND_CLOSEST(power, SCHED_LOAD_SCALE); + + if (nr_running/2 < capacity) + break; + } switch (flag) { case SD_BALANCE_WAKE: |